Ventilation for a reducing agent tank

Abstract

Ventilation for a reducing agent tank, having a first reducing agent tank which is provided with a first reducing agent fill opening, a fuel tank which is provided with a fuel fill opening and a ventilation device, as well as a first line through which the first reducing agent tank is connected to the fuel tank.

1. A ventilation system for a motor vehicle provided with a fuel tank and a reducing agent tank, comprising:
 a first ventilation line interconnecting said tanks; 
 a vent valve disposed at each end of said first ventilation line; 
 means for injecting fuel into said fuel tank; 
 a second ventilation line interconnecting said fuel tank and said fuel injecting means; 
 a third vent valve disposed at an end of said second ventilation line; and 
 means for injecting reducing agent into said reducing agent tank. 
 
     
     
       2. A system according to  claim 1  including a vent valve disposed in said second ventilation line between said third vent valve thereof and said fuel injecting means. 
     
     
       3. A system according to  claim 1  including a third ventilation line interconnecting said fuel and reducing agent tanks, provided with vent valves disposed at the ends thereof. 
     
     
       4. A system according to  claim 1  including means for heating said reducing agent tank. 
     
     
       5. A system according to  claim 1  including:
 a second reducing agent tank; 
 a ventilation line interconnecting said fuel tank and said second reducing agent tank, provided with vent valves at the ends thereof. 
 
     
     
       6. A system according to  claim 5  including means for injecting reducing agent into said second reducing agent tank.